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[B-4.2.1 Primary Production and CO₂ Budget in Forest Ecosystems(Final Report)]

[Contact Person]

KANAZAWA, Yoichi
Division director, Silviculture Division,
Hokkaido Research Center,
Forestry & Forest Products Research Institute,
Forestry Agency, Ministry of Agr., For., & Fish.
7 Hitsujigaoka, Toyohira, Sapporo 062 JAPAN
Tel:+81-11-851-4131, Fax:+81-11--851-4167
E-mail:ykanazaw@ffpri-hkd.affrc.go.jp

[Total Budget for FY1994-1996]

20,450,000 Yen (FY1996 7,015,000 Yen)

[Abstract]

　We conducted above- and below-ground biomass study, stem and root growth analyses, soil organic carbon and nitrogen storage estimation, and growth experiments under high temperature and doubling CO₂. We summarize ecosystem characteristics in continuous permafrost larch ecosystems as follows;
(1) About 30 to 40% of total biomass accumulated in the below-ground part in forest tundra ecosystems in eastern Siberia and taiga in central Siberia.
(2) Root growth rate might be affected by the environmental factors which were made by micro-topography. The functional relationship between stand level volume growth and carbon dynamics in the past was suggested.
(3) Organic soils and podzolic soils were not prevailing in eastern Siberia. Most soils of forest tundra had relatively low C/N ratio(below 15). On the other hand, soils in central Siberia and mountain forest tundra in eastern Siberia had higher C/N ratio(about 20), which was general cases in other circumpolar ecosystems.
(4) Further researches on biomass allocation, functional reconstruction in a stand level, and ecosystem process in potentially nitrogen rich condition under global warming are needed.

[Key Words]

Above -and below- ground biomass, Soil organic carbon, C/N ratio, Continuous permafrost, Larch ecosystems